There are 4 books in Our Australian Girl - Pearlie Series.
The Our Australian Girl series contains eleven four-part mini-series, the stories of Grace (1808), Letty (1841), Nellie (1849-1850), Poppy (1864), Rose (1900-1901), Alice (1918-1919), Daisy (1930), Ruby (1930-1931), Pearlie (1941-1942), Lina (1956), and Marly (1983).
Other series related to Our Australian Girl - Pearlie Series are Our Australian Girl - Poppy and Ghost in my Suitcase .